Question

The coil is rotated in a clockwise direction in the magnetic field at a constant rate to induce a current in the wire. If the direction of rotation of the coil is reversed and coil remains rotating at the same constant rate, Identify the correct statement .

• A. The current in the coil will reverse its direction
• B. The current in the coil will stop flowing
• C. The current in the coil will continue to flow in the same direction as before
• D. The current in the coil will decrease steadily
• E. The current in the coil will increase steadily

Answer 1

The correct option is A The current in the coil will reverse its direction

The induced emf in coil due to changing flux through it due to rotation of it is given by

$EMF=-N\frac{d\varphi }{dt}$

When the rotation direction of the coil is changed, $\frac{d\varphi }{dt}$ reverses its sign, and so does the emf.

Hence due to reverses potential difference in the attached circuit, the current also reverses its direction.